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No longer is the micro blog the terrain of weird, angst ridden, and mysterious-duffel-bag-carrying: micro blogs like twitter, as well as other social bookmarking sites, are now host to brands like Oprah Winfrey and Kmart, who are wielding the sites as powerful marketing weapons.

Kmart tweeted a deal yesterday for free shipping on KMart.com orders of $99 or more, according to Retailer Daily. This tweet follows a December 2008 tweet that gave 6 well-known bloggers a $500 gift certificate to go on a shopping spree at Kmart and asked them to share their shopping experience with other twitterers.